Tensor-force effects in the 2H(d

Abstract

Vector analyzing powers, tensor analyzing powers, and relative differential cross sections have been measured for the $^{2}(\mathrm{d}\ensuremath{\rightarrow}$,\ensuremath{\gamma}${)\mathrm{}}^{4}$He reaction at an incident energy of 10 MeV. Multipole decomposition and partial-wave analysis reveal that about 15% of the cross section involves processes in which the tensor force plays a role, either in the entrance or exit channel. Contrary to earlier claims, the reaction cannot be used to determine the D-state admixture in the $^{4}\mathrm{He}$ wave function unless the D state of the deuteron and other tensor-force effects in the entrance channel are taken into account.